Found conflicts between different versions of the same dependent assembly that could not be resolved.

my project is on top of .NET Core (1.0.4). when I build solution (it consist four projects) using dotnet `build command` I get following warnings:
```
Microsoft (R) Build Engine version 15.1.1012.6693
Copyright (C) Microsoft Corporation. All rights reserved.

MyProject.Domain -> /Users/sirwan/Documents/Projects/MyProject/src/MyProject.Domain/bin/Debug/netcoreapp1.1/MyProject.Domain.dll
/usr/local/share/dotnet/sdk/1.0.4/Microsoft.Common.CurrentVersion.targets(1964,5): warning MSB3277: Found conflicts between different versions of the same dependent assembly that could not be resolved. These reference conflicts are listed in the build log when log verbosity is set to detailed. [/Users/sirwan/Documents/Projects/MyProject/src/MyProject.Core/MyProject.Core.csproj]
MyProject.Core -> /Users/sirwan/Documents/Projects/MyProject/src/MyProject.Core/bin/Debug/netcoreapp1.1/MyProject.Core.dll
/usr/local/share/dotnet/sdk/1.0.4/Microsoft.Common.CurrentVersion.targets(1964,5): warning MSB3277: Found conflicts between different versions of the same dependent assembly that could not be resolved. These reference conflicts are listed in the build log when log verbosity is set to detailed. [/Users/sirwan/Documents/Projects/MyProject/test/MyProject.Test/MyProject.Test.csproj]
MyProject.Test -> /Users/sirwan/Documents/Projects/MyProject/test/MyProject.Test/bin/Debug/netcoreapp1.1/MyProject.Test.dll
/usr/local/share/dotnet/sdk/1.0.4/Microsoft.Common.CurrentVersion.targets(1964,5): warning MSB3277: Found conflicts between different versions of the same dependent assembly that could not be resolved. These reference conflicts are listed in the build log when log verbosity is set to detailed. [/Users/sirwan/Documents/Projects/MyProject/src/MyProject.Web/MyProject.Web.csproj]
MyProject.Web -> /Users/sirwan/Documents/Projects/MyProject/src/MyProject.Web/bin/Debug/netcoreapp1.1/MyProject.Web.dll

Build succeeded.

/usr/local/share/dotnet/sdk/1.0.4/Microsoft.Common.CurrentVersion.targets(1964,5): warning MSB3277: Found conflicts between different versions of the same dependent assembly that could not be resolved. These reference conflicts are listed in the build log when log verbosity is set to detailed. [/Users/sirwan/Documents/Projects/MyProject/src/MyProject.Core/MyProject.Core.csproj]
/usr/local/share/dotnet/sdk/1.0.4/Microsoft.Common.CurrentVersion.targets(1964,5): warning MSB3277: Found conflicts between different versions of the same dependent assembly that could not be resolved. These reference conflicts are listed in the build log when log verbosity is set to detailed. [/Users/sirwan/Documents/Projects/MyProject/test/MyProject.Test/MyProject.Test.csproj]
/usr/local/share/dotnet/sdk/1.0.4/Microsoft.Common.CurrentVersion.targets(1964,5): warning MSB3277: Found conflicts between different versions of the same dependent assembly that could not be resolved. These reference conflicts are listed in the build log when log verbosity is set to detailed. [/Users/sirwan/Documents/Projects/MyProject/src/MyProject.Web/MyProject.Web.csproj]
3 Warning(s)
0 Error(s)

Time Elapsed 00:00:16.69
```

I am wondering how t get rid of these warning messages. any idea?

PS: Here is the `csproj` files:
**MyProject.Core:**
```

netcoreapp1.1
MyProject.Core
MyProject.Core
false
false
false














All


All

```

**MyProject.Domain:**
```

netcoreapp1.1
portable
MyProject.Domain
MyProject.Domain
1.1.1
false
false
false







Always

```

**MyProject.Web:**
```

netcoreapp1.1
true
MyProject.Web
Exe
MyProject.Web
1.1.1
portable-net45+win8



























All


All

```

**MyProject.Test:**
```

netcoreapp1.1
portable
MyProject.Test
MyProject.Test
true
$(PackageTargetFallback);dotnet5.4;portable-net451+win8
1.1.1
false
false
false

```